Preheat oven to 350 degrees. Melt butter in a large nonstick skillet over medium heat. Add onion and garlic; sauté 5 minutes or until tender. Add spinach, water chestnuts, and artichokes; sauté 2 minutes. Add cream cheese, sour cream, 1/2 cup Cheddar cheese, and next 3 ingredients.
Spoon into an 11x7-inch baking dish coated with cooking spray. Top with remaining 1/2 cup Cheddar cheese. Bake at 350 degrees for 18 to 20 minutes or until thoroughly heated. Serve with baked tortilla chips.
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